Separator-sieve.



No. 803,977. PATENTED NOV. 7, 1905. w. 0. BLACK. SBPARATOR SIEVE. APPLICATION FILED MAY 19 1906 2 SHEETS-SHEET 2.

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mechanism illustrated in the accompanying UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Nov. *7, 1905.

Application filed May 19, 1905. Serial No. 261,158.

To all whom it may concern:

Be it known that I, WILLIAM 0. BLACK, a citizen of the United States, and a resident of Plymouth, in the county of Richland and State of Ohio, have invented-a new and useful Separator-Sieve, of which the following is a specification.

My invention relates to sieves for performing the final function of separating grain from the chaff, and is an improvement over the construction embodied in my United States Patent No. 759,068, dated May 3, 1904.

The object of my improvement is to construct a sieve in such a manner as to present a broken inclined surface in the direction of the blast, which blast will remain at the same inclination irrespecive of the adjustment of the slats varying the openings in the sieve.

A further object is to afford facilities for varying the openings in the surface of the sieve, thereby providing means for cleaning all kinds and sizes of grain.

A further object of this improvement is to provide a surface over which the grain is to pass that shall have no transverse obstructions to hinder the passage of the grain and that shall be so stiffened that it shall remain a perfectly flat plane at all times.

I attain these and other objects by the drawings, in which Figure 1 is a plan view view showing the sieve partly open. Fig. 2 is a cross-section on the line 2 2 of Fig. 1. Fig. 3 is an edge view of the mechanism, being that of the top edge in Fig. 1. Fig. 4 is a bottom view of the sieve. Fig. 5 is a cross-section on the line 5 5 of Fig. 4.

Similar reference characters refer to like parts throughout the several views.

In constructing my device I provide a rectangular frame composed of the longitudinal pieces 1 and 2, the end pieces 3 and 4, and the middle cross-piece 5. The cross-piece 5 is secured to the pieces 1 and 2 by means of the small plates 6. The sieve 7 rests on the side and end pieces and is provided with eX- tensions or straps 8, that extend around the side pieces and are secured to them and to the end pieces of the frame, as shown in Fig. 4., thus fastening all the parts together.

The plate 7 has a series of tongues 9 struck out of the same and bent downward, as shown. The inclination of these tongues may be varied, but is preferably about fortyfive degrees. The blast on the lower side of the sieve strikes against these tongues and is guided upward through the openings formed when these tongues are cut from the plate 7. I prefer to have these tongues formed nearly rectangular to adapt them to intercept a larger amount of air, which I find is an improvement over the semicircular form of tongue.

Slidable against the lower face of the plate 7 is a series of slats 10, which are held there by the end pieces 3 and 4 and the cross-piece 5, as shown in Fig. 2. A series of draw-bars 11 are positioned over the plate 7, which plate is provided with a series of slots 12, through which the straps 13, that engage the bars and slats, may slide. These straps are secured to the bars and slats and form the same into a grid. One slat is provided for each longitudinal line of openings and tongues 9 of the sieve, and thus the slats may be moved transverse to these lines of openings to re ulate their size.

A crank-she t 14 is carried in bearings 15 on the outer side of the side piece 1 of the frame, and the draw-bars 11 are provided with sleeves at their ends, which engage the crank-pins 16 of this shaft. When the size of the openings is to be changed, it may be done by means of a wrench applied to the end 17 of the crank-shaft. The side piece 1 of the frame is cut away to permit free movement of the ends of the draw-bars, which bars are flexible enough to permit bending.

A rearwardly-extending plate 18 prevents chaff from falling on the crank-shaft. V- shaped ridges 30 are secured to the sieve? plate 7, which protect the draw-bars, prevent grain from passing through the slots 12, and serve to keep the plate 7 perfectly flat. Directly over the cross-piece 5 I secure to the plate 7 a larger stiffening-rib 20, which prevents grain and chaff from lodging on that portion of the plate 7 over the cross-piece 5.

Along the front of the side piece 2 I secure an iron or steel bar 21 'for stiffening and protective purposes. Cleats 22 are secured to the top of the sieve to guide the material inward. For large sieves I secure the braces 24 to the side pieces 1 and 2, as shown in dotted lines in Fig. 4, and by means of the arms 25 I secure the braces to the tongues.

Many changes may be made in this construction Without departing from the spirit of my invention.

Having now explained my improvements,

what I claim as my invention, andidesire to secure by Letters Patent, is

1. A screen for separators comprising a frame, a sieve secured thereon, tongues struck from the surface of the sieve and bent downward, thus forming apertures, drawbars positioned above said sieve, a series of slats located below said sieve adjacent said apertures and tongues, straps secured to said slats and passing through slots in the sieve through slots in said plate to connect the draw-bar and slats, means for actuating said draw-bar, and a guard secured to said plate and extending over said draw-bar and the slots for the connecting-straps.

3. A screen for separators comprising a frame a perforated plate having downwardlyprojecting tongues stationarily mounted thereon, a series of imperforate slats slidable below the plate, the slats formed independent of each other, means connected with the slats for moving them to adjust the mesh of the screen, and guards to inclose the connecting means.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM C. BLACK.

Witnesses:

F. D. GUNsAULLUs, L. B. GUNSAULLUS. 

